Bending-roll



(No Model.) Y' C. A. BERT'SOH.

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Wtnessest. y Otani-w C. (2u/M Inventor LQ# @van cfa/y 4, kwin/mt@ WW W Attorney UNITED STATES PATENT EFICE.

VCHARLES A. BEiaTscI-I,v or CAMBRIDGE CITY, INDIANA.

BENDlNG-ROLL.

SPECIFICATION forming part of Letters Patent No. 408,685, dated August 13, 1889.

Application filed May 4, 1889. Serial No. 309,628. (No model.)

To a/ZZ whom t may concern:

Be it known that l, CHARLES A. BERTscII, of Cambridge City, Vayne county, Indiana, have invented certain new and useful Improvements in Bending-Rolls, of which the following is a speciiication.

This invention relates to machines for bending sheet metal, &c. Such machines generally consist of apair of rolls, which grip the metal and propel it forward over the third roll, which compels the metal to curl up out of its normal plane into a circle whose radius depends upon the adjusted position of the third roll. The two rolls which grip and propel the sheet' will be herein designated the pinching-rolls, while the third roll will be designated as the bending-roll. Sometimes in machines of this class the rolls are disposed pyramidally-that is to say, there are two lower rolls on one level and an upper roll centrally over these two. In this case lthe rolls all coact as bending-rolls and pinching-rolls, the degree of curvature of the bending being adjusted by adjusting the distance which the lower periphery of the upper roll projects below the upper peripheries of the lower rolls;

In exemplifying myinvention I have chosen to show two pinching-rolls and a bending-roll inthe manner first indicated.

In bending-rolls sometimes the sheets or rings ofv metal are bent into complete circles, which can only be removed from the rolls by some endwise system of withdrawal. This is generally provided for by hinging one of the bearings of. one of the pinching-rolls, so that this bearing can be removed, leaving the end of the roll clear' for the withdrawal of the ring which has been bent. Such removable bearing I term a buckle-bearing. The pinching-rolls having been properly adjusted to pinch the sheet,it becomes generally necessary to throw them out of such adjustment, in order to permit the rolled-up sheet or ring to be removed, and when a second sheet or ring is tobe rolled a new accurate pinching adj nstment is called for.

One object of my invention is to avoid the necessity for this accurate adjustment or for any disturbance of the accurately-pin chin g adjustment.

A further object is to provide for readily opening the rolls at the time of removing the buckle-bearing.

A further object is to cause one pinchingroll to counterbalance the weight of the other pinching-roll, in order that the opening of the rolls may be performed with ease.

The principle of my invention will be readily understood froln the following description of an exempliication of it, taken in connection with the accompanying drawings, in which- Figure 1 is a front elevation of a bendingmachine, exemplifying my improvements; Fig. 2, an elevation, at the tail end thereof the right hand of Fig. l being considered as f the tail end of the machine and the left-hand end as the head of the machine; Fig. 3, an elevation of the right-hand face of the headhousing, various parts appearing in vertical section in plane of line a of Fig. l; Fig. 4, an elevation, in the same -plane as in Fig. 3, of the head-box of the lower pinching-roll with its immediate accessories; Fig. 5, a front elevation of the right-hand portion of the rolls, viewed as in Fig. l, but with the tail-housin g appearing in vertical section in the plane of line ZJ of Fig. 2; Fig. 6, an elevation similar to Fig. 5, but showing the buckle-bearing as removed and the tail-housing in Vertical section in the plane of line c of Fig. 2.

, In the drawings, A indicates the head-housing; B, the tail-housing; C, the top pinching- I roll; D, the lower pinching-roll; E, the bending-roll arranged for adjustment in the housings in the usual manner; F, the head-journal of the top pinching-roll, having its usual bearing in the head-housing and projecting outwardly beyond the same, as usual, for the reception of gearing, `an outboard-bearing, &c.; G, the tail-bearing of the top pinchingroll; Il, the usual gearing connecting the two pinching-rolls; J, wedges under the boxes of the lower pinching roll to serve as a means for vertically adjusting that roll to secure the desired pinch upon the sheet; K, the headbox of the lower pinching-roll, vertically adj ustable in the head-housing and adjusted therein for the desired pinch by means of its proper wedge; L, the tail-box ofl the lower pinching-roll, similarly arranged and similarly adjusted in the tail-housing; M, a movable support under the head-box K, this movable support taking the form, inthe exempliiication, of a block adapted to slide vertically in the housing, this block forming the.

abutment on which the appropriate wedge ICO acts; N, an outboard-bearing upon the journal F; O, alever disposed along under the rolls an d journaled to the head-housing and projecting therefrom to the tail-housing, and projecting, also, outwardly beyond the head-housin g, this lever engaging under the block M; P, a link connecting the outboard-bearing with the lever O, where the lever projects beyond the head-housing; Q, the usual hand-screws for operating the wedges; R, the tail-journal of the lower pinching-roll; S, the buckle-bearing hinged to the tail-housing and engaging the tail-journal of the top pinching-roll, and adapted to be swung out of engagement with that journal, as indicated in Fig. 6; T, the pivot on which the buckle-bearing swings; U, a crank on the tail-j ournal of the lower pinching-roll, to serve in turning the pinching-roll by hand; V, a vertical slot through the bucklebearing to permit the swinging of the bucklebearing past the crank; IV, a removable pin engaging the tail-housing and the bucklebearing when the buckle-bearing is in normal position, this pin serving as a latchment for holding the buckle-bearing in normal position and for permitting the buckle-bearing to be swung out of normal position; X, an opening-lever fulcrumed upon the pivot of the buckle-bearing and normallystanding upright contiguous to the buckle-bearing; Y, a cam upon the lower end of this opening-lever, engaging under the lever O, and serving,when the opening-leveris properly manipulated, to elevate the tail end of the lever O; Z, a lock-lug upon the opening-lever, engaging over the tail end of the lever O, when the parts are in normal position; a in Fig. 1, the section-plane of Figs. 3 and 4; Z) in Fig. 9, the section-plane of Fig. 5; c in Fig. 2, the scctionplane-of Fig. G; d, a removable pin engaging the opening-lever X and the bucklebearing and serving as a latchment by which these two parts may be integrated or segregated, and c an adjustable weighted lever formed at the top of the buckle-bearing.

In bending a sheet or bar these rolls operate in the ordinary manner and are adjusted in the ordinary manner, my improved construction presenting no features of novelty in this respect.

Vhen a sheet or bar has been bent into a ring upon the top roll and it is desired to remove the ring from the roll, the latchment IV is disengaged and the buckle-bearing swung out of engagement with the tail-bearing of the top pinching-roll, thus leaving the tail end of the top pinching-roll clear, so as to permit the removal of the ring. This is as usual, my construction presenting no features of novelty in this respect; but in ordinary construction, when the buckle-bearing has been swung clear, the wedges or other devices employed for effecting the pinching adjustment 0f the pinching-rolls would require t0 be manipulated in order to separate the pinching-roll, so as to permit the ring to be freely withdrawn, and before bending a new ring of the saine thickness and metal a readjustment of these devices would be called for. In the illustrated machine exemplifying my 'improvements the rolls are opened without disturbing the pinch-adj usting devices. Assuming that the buckle-bearin g has been turn ed down into the position indicated in Fig. 6 implies that the latch-pin d has been disengaged, so as to permit the buckle-bearing to swing down and leave the openinglever X in normal position. The opening-lever is now turned down and the cam at its foot pries up the tail end of the lever O. This pulls down the outboardbearing N and elevates the top opening-roll and to a certain extent opens the rolls; but this certain extent might not be sufficient on very wide sheets, owing to the fact that the head end of the top roll rises but very little, the head-housing forming the fulerum on which the top roll pivots, so to speak. It is to be understood, of course, that the tail-bearing of the top pinching-roll is to have clearance, so as to permit this tilting of the top roll. This clearance may be given by depressing the lower surface of the bearing or by giving the bearing the form of a vertical ellipse, as indicated in the drawings. This detracts, of course, from the bearing-surface under the journal; but when the machine is under the strains of work the strains are all niet at the top bearing-surface, which needs no clearance.

In order to increase the amount of the rollopening movement, I consider it advisable to lower the head end of the lower pinching-roll simultaneous with the raising of the top pin ehing-roll. This I accomplish in the exemplifieation by supporting the wedge of the head box of the lower pinching-roll by means of the lever O, so that the same motion of the lever O which tilts the top pinching-roll to the opening position will permit the head end of the lower pinching-roll to descend. The tail end of the lower pinch-roll is not disturbed, but simply tips a little in its box. Now it will also be apparent that this principle of construction not only secures an advantageous v'opening of the rolls, but also that the weight of the head end of the lower pinching-roll counterbalances to a certain extent the weight of the upper roll. Therefore the attendant in operating the opening-lever to elevate the top roll finds the weight of the lower roll aiding him. Instead of disengaging the latch-pin (l and operating the bucklebcaring, and subsequently the opening-lever, the latch-pin (l may be left in engagement, and then the mere act of swinging the bucklebearing down will serve to open the rolls. Not only is this the case, but the weight of the heavy buckle-bearing then becomes an element in the eounterbalancing system, the weight of the lower roll helping to counterbalance the buckle-bearing, and vice versa. The parts may in the process of construction be proportioned into such degree of counterbalancing as is desired, or the lower pinching-roll may be arranged for preponderance,

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` and the adjustable weight-lever .c on the buckle-bearing be arranged to bring about the desired equalization. An advantage of this latter feature is that heavy rings being produced add their weight to the weight of the lower pinching-roll, and the adjustable Weight e serves as a means by which this can be compensated for as the work progresses.

It will be understood that as the bucklebearing moves outwardly it moves in the .arc of a icircle, and that, therefore, in order to clear its roll-journal the bearing-aperture must have the proper clearance below, similar to the head-bearing of the top roll. This is common practice, I believe, in buckle-bearing construction.

It is to be understood, of course, that the machine illustrated is a mere exemplitication of my invention.

merits of my invention are available in rolls in which but two rolls are used-such m"a chines, for instance, as are employed in longitudinally-corrugating tubes and rings,'in which machines the bending-roll is of course not needed. In practice I have employed my present invention in this class of machines, as well as in machines provided with the third roll for bending purposes.

I clailn as my inventionl. In bending-rolls, the combination, substantially as set forth, of a pair of housings, top and bottom pinching-rolls j'ournaled therein, a removable buckle-bearing at the tail end of the top pinching-roll, an outboard-bearing 'at the head end of the pinching-roll, and mechanism connecting said buckle-bearin g and outboard-bearing in such manner that the disengagement of the bucklebear-ing will cause the depression of said outboard-bearing.

2. In bending-rolls, the combination, substantially as set forth, of a pair of housings, top and bottom pinching-rolls journaled therein, a buckle-bearing engaging the tailjournal of the top pinching-roll, a verticallymovable support for the head-bearing of the bottom pinching-roll, and mechanism connecting said buckle-b earing and supported in such manner that the disengagement of the buckle-bearing will permit the descent of said support.

In bending-rolls, the combination, substantially as set forth, `of a pair of housings, top and bottom pinching-rolls journaled therein, a buckle-bearing engaging the tailjournal of thetop pinching-roll, an outboardbearing at the head end of the top pinchingroll, a vertically-movable support for the head-bearing of the lower pinching-roll, and mechanism connecting said buckle-bearing and outboard-bearin g and movably supported in such manner that the disengagement of the buckle-bearing causes-the descent of said outboard-bearing and movable support.

4. In bending-rolls, the combination, substantially as set forth, of a pair of housings, topl and bottom pinching-rolls journaled therein, a buckle-bearing engaging the tailjournal of the top pinching-roll, an outboardbearing at the head of the top pinching-roll, a roll-opening lever, and mechanism connecting said lever with said outboard-bearing in such manner that the manipulation 4of said lever may serve in elevating and depressing said outboard-bearing.

5. In bending-rolls, the combination, substantially as set forth, of a pair of housings, top and bot-tom pinchingrolls journaled therein, a buckle-bearing engaging thetailjournal of the top pinching-roll, a vertically- .movable support for the head-bearing of the lower pinching-roll, a roll-opening lever, and mechanism connecting said lever with said movable support in such manner that the manipulation of said lever produces vertical movement of said vertical support.

6. In bending-rolls, the combination, substantially as set forth, of a pair of housings, top and bottom pinching-rolls journaled therein, a buckle-bearing engaging the tailjournal of the top pinching-roll, an outboardbearing at the head of the top pinching-roll,

a vertically-movable support for the headbearing of the lower pinching-roll, a roll-opening lever,and mechanism connecting said lever with said outboard-bearing and said movable support in such manner that the manipulation of the lever will elevate or depress said outboard-bearin g and movable support.

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'7. In bending-rolls, the combination, substantially as set forth, of a pair of housings, top and bottom pinchingrolls journaled therein,a vertically-moving bearing for the head-journal of one of said pinching-rolls, a buckle-bearing engaging the tail-journal of the top pinching-roll, mechanism connecting said 'buckle-bearing with said vertically-moving bearing in such manner that the disengagement of the buckle-bearing causes a rollopening movement of said vertical bearing, and an adjustable counterbalance-weight on said buckle-bearing.

8. In bending-rolls, the combination, substantially as set forth, of a pair of housings, top and bottom pinchingrolls journaled therein, a crank at the tail of the lower pinching-roll, and a buckle-bearing engaging the tail-journal of the top pinching roll and vertically slotted at said crank.

CHARLES A. BERTSCH.

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